== in hive
The= and == operators have the same functionality.
They are implemented by the exact same class.
system.registerGenericUDF("=", GenericUDFOPEqual.class);
system.registerGenericUDF("==", GenericUDFOPEqual.class);
FunctionRegistry.java
+----------+---------------------+----------------------------------------------------------------+
| Operator | Operand types | Description |
+----------+---------------------+----------------------------------------------------------------+
| A = B | All primitive types | TRUE if expression A is equal to expression B otherwise FALSE. |
| A == B | All primitive types | Synonym for the = operator. |
+----------+---------------------+----------------------------------------------------------------+